diff --git a/Eigen/src/Core/arch/SSE/PacketMath.h b/Eigen/src/Core/arch/SSE/PacketMath.h
index 2d82c66e2..35490a602 100755
--- a/Eigen/src/Core/arch/SSE/PacketMath.h
+++ b/Eigen/src/Core/arch/SSE/PacketMath.h
@@ -32,7 +32,7 @@ namespace internal {
 #endif
 #endif
 
-#if ((defined EIGEN_VECTORIZE_AVX) && (EIGEN_COMP_GNUC_STRICT || EIGEN_COMP_MINGW) && (__GXX_ABI_VERSION < 1004)) || EIGEN_OS_QNX
+#if ((defined EIGEN_VECTORIZE_AVX) && (EIGEN_COMP_GNUC_STRICT || EIGEN_COMP_MINGW || EIGEN_COMP_LCC) && (__GXX_ABI_VERSION < 1004)) || EIGEN_OS_QNX
 // With GCC's default ABI version, a __m128 or __m256 are the same types and therefore we cannot
 // have overloads for both types without linking error.
 // One solution is to increase ABI version using -fabi-version=4 (or greater).
@@ -443,7 +443,7 @@ template<> EIGEN_STRONG_INLINE Packet16b pcmp_eq(const Packet16b& a, const Packe
 template<> EIGEN_STRONG_INLINE Packet4i pcmp_le(const Packet4i& a, const Packet4i& b) { return por(pcmp_lt(a,b), pcmp_eq(a,b)); }
 
 template<> EIGEN_STRONG_INLINE Packet4f pmin<Packet4f>(const Packet4f& a, const Packet4f& b) {
-#if EIGEN_COMP_GNUC && EIGEN_COMP_GNUC < 63
+#if EIGEN_COMP_GNUC_STRICT && EIGEN_COMP_GNUC < 63
   // There appears to be a bug in GCC, by which the optimizer may
   // flip the argument order in calls to _mm_min_ps, so we have to
   // resort to inline ASM here. This is supposed to be fixed in gcc6.3,
@@ -462,7 +462,7 @@ template<> EIGEN_STRONG_INLINE Packet4f pmin<Packet4f>(const Packet4f& a, const
 #endif
 }
 template<> EIGEN_STRONG_INLINE Packet2d pmin<Packet2d>(const Packet2d& a, const Packet2d& b) {
-#if EIGEN_COMP_GNUC && EIGEN_COMP_GNUC < 63
+#if EIGEN_COMP_GNUC_STRICT && EIGEN_COMP_GNUC < 63
   // There appears to be a bug in GCC, by which the optimizer may
   // flip the argument order in calls to _mm_min_pd, so we have to
   // resort to inline ASM here. This is supposed to be fixed in gcc6.3,
@@ -493,7 +493,7 @@ template<> EIGEN_STRONG_INLINE Packet4i pmin<Packet4i>(const Packet4i& a, const
 
 
 template<> EIGEN_STRONG_INLINE Packet4f pmax<Packet4f>(const Packet4f& a, const Packet4f& b) {
-#if EIGEN_COMP_GNUC && EIGEN_COMP_GNUC < 63
+#if EIGEN_COMP_GNUC_STRICT && EIGEN_COMP_GNUC < 63
   // There appears to be a bug in GCC, by which the optimizer may
   // flip the argument order in calls to _mm_max_ps, so we have to
   // resort to inline ASM here. This is supposed to be fixed in gcc6.3,
diff --git a/Eigen/src/Core/products/GeneralBlockPanelKernel.h b/Eigen/src/Core/products/GeneralBlockPanelKernel.h
index bd5aac1ca..076b95f67 100644
--- a/Eigen/src/Core/products/GeneralBlockPanelKernel.h
+++ b/Eigen/src/Core/products/GeneralBlockPanelKernel.h
@@ -1203,7 +1203,7 @@ struct lhs_process_one_packet
     traits.madd(*A0, *rhs_panel, *C1, *T0, fix<1>);
     traits.madd(*A0, *rhs_panel, *C2, *T0, fix<2>);
     traits.madd(*A0, *rhs_panel, *C3, *T0, fix<3>);
-    #if EIGEN_GNUC_AT_LEAST(6,0) && defined(EIGEN_VECTORIZE_SSE)
+    #if EIGEN_GNUC_AT_LEAST(6,0) && defined(EIGEN_VECTORIZE_SSE) && !(EIGEN_COMP_LCC)
     __asm__  ("" : "+x,m" (*A0));
     #endif
     EIGEN_ASM_COMMENT("end step of gebp micro kernel 1X4");
@@ -1729,7 +1729,7 @@ void gebp_kernel<LhsScalar,RhsScalar,Index,DataMapper,mr,nr,ConjugateLhs,Conjuga
 
           // NOTE: the begin/end asm comments below work around bug 935!
           // but they are not enough for gcc>=6 without FMA (bug 1637)
-          #if EIGEN_GNUC_AT_LEAST(6,0) && defined(EIGEN_VECTORIZE_SSE)
+          #if EIGEN_GNUC_AT_LEAST(6,0) && defined(EIGEN_VECTORIZE_SSE) && !(EIGEN_COMP_LCC)
             #define EIGEN_GEBP_2PX4_SPILLING_WORKAROUND __asm__  ("" : [a0] "+x,m" (A0),[a1] "+x,m" (A1));
           #else
             #define EIGEN_GEBP_2PX4_SPILLING_WORKAROUND
diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index 8754860ec..1fcb902fe 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -236,9 +236,16 @@
   #define EIGEN_COMP_CLANGCPE 0
 #endif
 
+/// \internal EIGEN_COMP_LCC set to 1 if the compiler is MCST-LCC (MCST eLbrus Compiler Collection)
+#if defined(__LCC__) && defined(__MCST__)
+  #define EIGEN_COMP_LCC (__LCC__*100+__LCC_MINOR__)
+#else
+  #define EIGEN_COMP_LCC 0
+#endif
+
 
 /// \internal EIGEN_GNUC_STRICT set to 1 if the compiler is really GCC and not a compatible compiler (e.g., ICC, clang, mingw, etc.)
-#if EIGEN_COMP_GNUC && !(EIGEN_COMP_CLANG || EIGEN_COMP_ICC || EIGEN_COMP_CLANGICC || EIGEN_COMP_MINGW || EIGEN_COMP_PGI || EIGEN_COMP_IBM || EIGEN_COMP_ARM || EIGEN_COMP_EMSCRIPTEN || EIGEN_COMP_FCC || EIGEN_COMP_CLANGFCC || EIGEN_COMP_CPE || EIGEN_COMP_CLANGCPE)
+#if EIGEN_COMP_GNUC && !(EIGEN_COMP_CLANG || EIGEN_COMP_ICC || EIGEN_COMP_CLANGICC || EIGEN_COMP_MINGW || EIGEN_COMP_PGI || EIGEN_COMP_IBM || EIGEN_COMP_ARM || EIGEN_COMP_EMSCRIPTEN || EIGEN_COMP_FCC || EIGEN_COMP_CLANGFCC || EIGEN_COMP_CPE || EIGEN_COMP_CLANGCPE || EIGEN_COMP_LCC)
   #define EIGEN_COMP_GNUC_STRICT 1
 #else
   #define EIGEN_COMP_GNUC_STRICT 0